scholarly journals Selectively Deuterated Liquid Crystalline Cyanoazobenzene Side-Chain Polyesters. 3. Investigations of Laser-Induced Segmental Mobility by Fourier Transform Infrared Spectroscopy

1998 ◽  
Vol 31 (7) ◽  
pp. 2141-2151 ◽  
Author(s):  
Christian Kulinna ◽  
Søren Hvilsted ◽  
Claudia Hendann ◽  
Heinz W. Siesler ◽  
P. S. Ramanujam
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Liquid Crystalline ◽  
Fourier Transform Infrared ◽  
Side Chain ◽  
Segmental Mobility

Characterization of cooperative conformational transitions by Fourier transform infrared spectroscopy: application to phospholipid binary mixtures

1985 ◽  
Vol 63 (7) ◽  
pp. 1925-1932 ◽  
Author(s):  
R. A. Dluhy ◽  
D. Moffatt ◽  
D. G. Cameron ◽  
R. Mendelsohn ◽  
H. H. Mantsch
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Liquid Crystalline ◽  
Fourier Transform Infrared ◽  
Conformational Transitions ◽  
Population Parameter ◽  
Thermodynamic Quantities ◽  
Two Phases ◽  
Two State Model

Temperature-induced cooperative conformational transitions in biopolymers may be examined in aqueous solution by the use of Fourier transform infrared spectroscopy. The transition is described in terms of a two-state model with a fractional population parameter (which describes the degree of transition at various values intermediate between the two limiting cases) that can be generated by a least-squares technique. This procedure allows for calculation of a conformational index without assuming a linear dependence of the infrared parameter on the extent of transition. Calculations based on the Zimm–Bragg theory of cooperative conformational transitions allow thermodynamic quantities to be derived using the conformational index in conjunction with calorimetric measurements.The method is illustrated with data from the gel/liquid-crystalline phase transitions of binary phospholipid vesicles where the use of isotopic substitution allows the conformation of each component of the binary mixture to be independently monitored. The data suggest the coexistence of well-defined structural domains of phospholipid as well as the preferential clustering of one of the lipid components at the interface between the two phases.

Study of Hydrogen Bonding in Liquid Crystalline Solvent by Fourier Transform Infrared Spectroscopy

2006 ◽  
Vol 110 (47) ◽  
pp. 12887-12890 ◽  
Author(s):  
Guillaume Palaprat ◽  
Jean-Daniel Marty ◽  
Corinne Routaboul ◽  
Armand Lattes ◽  
Anne-Françoise Mingotaud ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Liquid Crystalline ◽  
Fourier Transform Infrared
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